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Lee S. Design Principle of Reactive Components for Dimethacrylate‐Terminated Quantum Dots: Preserved Photoluminescent Quantum Yield, Excellent Pattern Uniformity, and Suppression of Aggregation in the Matrix. MACROMOL CHEM PHYS 2020. [DOI: 10.1002/macp.201900488] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Seonwoo Lee
- Department of Electrical and Computer EngineeringInter‐university Semiconductor Research CenterSeoul National University 1 Gwanakro, Gwanak‐gu Seoul 08826 Republic of Korea
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2
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Lee JH, Choi HJ, Lee C, Song SW, Lee JB, Huh D, Nam YS, Jeon DY, Lee H, Jung YS. Spontaneous Registration of Sub-10 nm Features Based on Subzero Celsius Spin-Casting of Self-Assembling Building Blocks Directed by Chemically Encoded Surfaces. ACS NANO 2018; 12:8224-8233. [PMID: 30067895 DOI: 10.1021/acsnano.8b03378] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
For low-cost and facile fabrication of innovative nanoscale devices with outstanding functionality and performance, it is critical to develop more practical patterning solutions that are applicable to a wide range of materials and feature sizes while minimizing detrimental effects by processing conditions. In this study, we report that area-selective sub-10 nm pattern formation can be realized by temperature-controlled spin-casting of block copolymers (BCPs) combined with submicron-scale-patterned chemical surfaces. Compared to conventional room-temperature spin-casting, the low temperature ( e.g., -5 °C) casting of the BCP solution on the patterned self-assembled monolayer achieved substantially improved area selectivity and uniformity, which can be explained by optimized solvent evaporation kinetics during the last stage of film formation. Moreover, the application of cold spin-casting can also provide high-yield in situ patterning of light-emitting CdSe/ZnS quantum dot thin films, indicating that this temperature-optimized spin-casting strategy would be highly effective for tailored patterning of diverse organic and hybrid materials in solution phase.
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Affiliation(s)
- Jung Hye Lee
- Department of Materials Science and Engineering , Korea Advanced Institute of Science and Technology (KAIST) , 291 Daehak-ro , Yuseong-gu, Daejeon 34141 , Republic of Korea
| | - Hak-Jong Choi
- Department of Materials Science and Engineering , Korea University , 145 Anam-ro , Seongbuk-gu, Seoul 02841 , Republic of Korea
| | - ChulHee Lee
- Department of Materials Science and Engineering , Korea Advanced Institute of Science and Technology (KAIST) , 291 Daehak-ro , Yuseong-gu, Daejeon 34141 , Republic of Korea
| | - Seung Won Song
- Department of Materials Science and Engineering , Korea Advanced Institute of Science and Technology (KAIST) , 291 Daehak-ro , Yuseong-gu, Daejeon 34141 , Republic of Korea
| | - Joong Bum Lee
- Department of Materials Science and Engineering , Korea Advanced Institute of Science and Technology (KAIST) , 291 Daehak-ro , Yuseong-gu, Daejeon 34141 , Republic of Korea
| | - Daihong Huh
- Department of Materials Science and Engineering , Korea University , 145 Anam-ro , Seongbuk-gu, Seoul 02841 , Republic of Korea
| | - Yoon Sung Nam
- Department of Materials Science and Engineering , Korea Advanced Institute of Science and Technology (KAIST) , 291 Daehak-ro , Yuseong-gu, Daejeon 34141 , Republic of Korea
| | - Duk Young Jeon
- Department of Materials Science and Engineering , Korea Advanced Institute of Science and Technology (KAIST) , 291 Daehak-ro , Yuseong-gu, Daejeon 34141 , Republic of Korea
| | - Heon Lee
- Department of Materials Science and Engineering , Korea University , 145 Anam-ro , Seongbuk-gu, Seoul 02841 , Republic of Korea
| | - Yeon Sik Jung
- Department of Materials Science and Engineering , Korea Advanced Institute of Science and Technology (KAIST) , 291 Daehak-ro , Yuseong-gu, Daejeon 34141 , Republic of Korea
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3
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Ushakova EV, Cherevkov SA, Litvin AP, Parfenov PS, Kasatkin IA, Fedorov AV, Gun'ko YK, Baranov AV. 3D superstructures with an orthorhombic lattice assembled by colloidal PbS quantum dots. NANOSCALE 2018; 10:8313-8319. [PMID: 29687825 DOI: 10.1039/c8nr01163j] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
We report a new type of metamaterial comprising a highly ordered 3D network of 3-7 nm lead sulfide quantum dots self-assembled in an organic matrix formed by amphiphilic ligands (oleic acid molecules). The obtained 3D superstructures possess an orthorhombic lattice with the distance between the nanocrystals as large as 10-40 nm. Analysis of self-assembly and destruction of the superstructures in time performed by a SAXS technique shows that their morphology depends on the quantity of amphiphilic ligands and width of the quantum dot size and its distribution. Formation of the superstructures is discussed in terms of a model describing the lyotropic crystal formation by micelles from three-phase mixtures. The results show that the organic molecules possessing surfactant properties and capable of forming micelles with nanoparticles as a micelle core can be utilized as building blocks for the creation of novel metamaterials based on a highly ordered 3D network of semiconductors, metals or magnetic nanoparticles.
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4
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Stewart M, Susumu K, Oh E, Brown CG, McClain CC, Gorzkowski EP, Boyd DA. Fabrication of Photoluminescent Quantum Dot Thiol-yne Nanocomposites via Thermal Curing or Photopolymerization. ACS OMEGA 2018; 3:3314-3320. [PMID: 31458587 PMCID: PMC6641478 DOI: 10.1021/acsomega.8b00319] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2018] [Accepted: 03/08/2018] [Indexed: 05/07/2023]
Abstract
Strong, flexible, and transparent materials have garnered tremendous interest in recent years as materials and electronics manufacturers pursue devices that are bright, flexible, durable, tailorable, and lightweight. Depending on the starting components, polymers fabricated using thiol-yne chemistry have been shown to be exceptionally strong and/or flexible, while also being amenable to modification by the incorporation of nanoparticles. In the present work, novel ligands were synthesized and used to functionalize quantum dots (QDs) of various diameters. The functionalized QDs were then incorporated into thiol-yne prepolymer matrices. These matrices were subsequently polymerized to form QD thiol-yne nanocomposite polymers. To demonstrate the versatility of the fabrication process, the prepolymers were either thermally cured or photopolymerized. The resulting transparent nanocomposites expressed the size-specific color of the QDs within them when exposed to ultraviolet irradiation, demonstrating that QDs can be incorporated into thiol-yne polymers without significantly altering QD expression. With the inclusion of QDs, thiol-yne nanocomposite polymers are promising candidates for use in numerous applications including as device display materials, optical lens materials, and/or sensor materials.
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Affiliation(s)
- Michael
H. Stewart
- Optical
Sciences Division, Materials Science and Technology Division, Naval Research Laboratory, 4555 Overlook Avenue SW, Washington, DC 20375, United States
| | - Kimihiro Susumu
- Sotera
Defense Solutions, Inc., 7230 Lee Deforest Dr Ste 100, Columbia, Maryland 21046, United States
| | - Eunkeu Oh
- Sotera
Defense Solutions, Inc., 7230 Lee Deforest Dr Ste 100, Columbia, Maryland 21046, United States
| | - Christopher G. Brown
- University
Research Foundation, 6411 Ivy Ln Ste 110, Greenbelt, Maryland 20770, United
States
| | - Collin C. McClain
- University
Research Foundation, 6411 Ivy Ln Ste 110, Greenbelt, Maryland 20770, United
States
| | - Edward P. Gorzkowski
- Optical
Sciences Division, Materials Science and Technology Division, Naval Research Laboratory, 4555 Overlook Avenue SW, Washington, DC 20375, United States
| | - Darryl A. Boyd
- Optical
Sciences Division, Materials Science and Technology Division, Naval Research Laboratory, 4555 Overlook Avenue SW, Washington, DC 20375, United States
- E-mail: (D.A.B.)
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5
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Liang XY, Wang L, Chang ZY, Ding LS, Li BJ, Zhang S. Reusable Xerogel Containing Quantum Dots with High Fluorescence Retention. Polymers (Basel) 2018; 10:polym10030310. [PMID: 30966345 PMCID: PMC6414965 DOI: 10.3390/polym10030310] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2017] [Revised: 03/02/2018] [Accepted: 03/07/2018] [Indexed: 12/03/2022] Open
Abstract
Although various analytical methods have been established based on quantum dots (QDs), most were conducted in solution, which is inadequate for storage/transportation and rapid analysis. Moreover, the potential environmental problems caused by abandoned QDs cannot be ignored. In this paper, a reusable xerogel containing CdTe with strong emission is established by introducing host–guest interactions between QDs and polymer matrix. This xerogel shows high QDs loading capacity without decrease or redshift in fluorescence (the maximum of loading is 50 wt % of the final xerogel), which benefits from the steric hindrance of β-cyclodextrin (βCD) molecules. Host–guest interactions immobilize QDs firmly, resulting in the excellent fluorescence retention of the xerogel. The good detecting performance and reusability mean this xerogel could be employed as a versatile analysis platform (for quantitative and qualitative analyses). In addition, the xerogel can be self-healed by the aid of water.
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Affiliation(s)
- Xiang-Yong Liang
- Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China.
- College of Life Sciences, University of Chinese Academy of Sciences, Beijing 100049, China.
| | - Lu Wang
- Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China.
- College of Life Sciences, University of Chinese Academy of Sciences, Beijing 100049, China.
| | - Zhi-Yi Chang
- Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China.
- College of Life Sciences, University of Chinese Academy of Sciences, Beijing 100049, China.
| | - Li-Sheng Ding
- Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China.
| | - Bang-Jing Li
- Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China.
| | - Sheng Zhang
- State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Sichuan University, Chengdu 610065, China.
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6
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Nagarjuna R, Saifullah MSM, Ganesan R. Oxygen insensitive thiol–ene photo-click chemistry for direct imprint lithography of oxides. RSC Adv 2018; 8:11403-11411. [PMID: 35542774 PMCID: PMC9079138 DOI: 10.1039/c8ra01688g] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2018] [Accepted: 03/16/2018] [Indexed: 01/04/2023] Open
Abstract
UV-nanoimprint lithography (UV-NIL) is a promising technique for direct fabrication of functional oxide nanostructures. Since it is mostly carried out in aerobic conditions, the free radical polymerization during imprinting is retarded due to the radical scavenging ability of oxygen. Therefore, it is highly desirable to have an oxygen-insensitive photo-curable resin that not only alleviates the requirement of inert conditions but also enables patterning without making substantial changes in the process. Here we demonstrate the formulation of metal-containing resins that employ oxygen-insensitive thiol–ene photo-click chemistry. Allyl acetoacetate (AAAc) has been used as a bifunctional monomer that, on one hand, chelates with the metal ion, and on the other hand, offers a reactive alkene group for polymerization. Pentaerythritol tetrakis(3-mercaptopropionate) (PETMP), a four-arm thiol derivative, is used as a crosslinker as well as an active component in the thiol–ene photo-click chemistry. The FT-IR analyses on the metal-free and metal-containing resin formulations revealed that the optimum ratio of alkene to thiol is 1 : 0.5 for an efficient photo-click chemistry. The thiol–ene photo-click chemistry has been successfully demonstrated for direct imprinting of oxides by employing TiO2 and Ta2O5 as candidate systems. The imprinted films of metal-containing resins were subjected to calcination to obtain the corresponding patterned metal oxides. This technique can potentially be expanded to other oxide systems as well. Metal-containing oxygen-insensitive photocurable resin formulations are designed based on thiol–ene click chemistry that are suitable for UV nanoimprinting to directly pattern oxides.![]()
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Affiliation(s)
- Ravikiran Nagarjuna
- Department of Chemistry
- Birla Institute of Technology and Science (BITS) Pilani, Hyderabad Campus
- Hyderabad
- India
| | - Mohammad S. M. Saifullah
- Institute of Materials Research and Engineering
- A*STAR (Agency for Science, Technology, and Research)
- Singapore 138634
- Republic of Singapore
| | - Ramakrishnan Ganesan
- Department of Chemistry
- Birla Institute of Technology and Science (BITS) Pilani, Hyderabad Campus
- Hyderabad
- India
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7
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Jeong S, Park H, Seon D, Choi J, Hong KB, Lee J, Kim C, Kim JK, Park MH. Modulatory Functionalization of Gold Nanorods Using Supramolecular Assemblies. Chem Asian J 2017; 12:2591-2596. [PMID: 28815986 DOI: 10.1002/asia.201700932] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2017] [Revised: 08/07/2017] [Indexed: 01/05/2023]
Abstract
Supramolecular-assembly-mediated functionalization of gold nanorods (GNRs) has been developed by reversible phase transfer between water and oils, which offers a facile method for fabricating robust GNRs with surface-charge tunability. In this regard, trimethylammonium (TMA) GNRs were initially prepared from conventional cetyltrimethylammonium bromide (CTAB) GNRs by means of a ligand-exchange reaction in the presence of an excess amount of TMA ligands. To further expand their functionality and potential applications, electrostatic assemblies of positively charged TMA-GNRs with negatively charged oleate ions were prepared. These assemblies (OA-GNRs) can undergo facile phase transfer from water to hexane. Interestingly, the reversible electrostatic assembly between the TMA and OA ions fabricated onto GNRs can be easily disrupted by treatment with HCl, which removes the OA ions from the GNRs to re-form the TMA-GNRs, which can be made soluble in aqueous media again. In addition, OA-GNRs can be further used for the synthesis of negatively charged GNRs such as 11-mercaptoundecanoic acid (MUA) GNRs, which are hard to prepare directly from CTAB-GNRs. This versatile method for phase transfer and functionalization on GNRs is expected to broaden the scope of their applications in sensing, biomedical imaging, photothermal therapies, and drug delivery systems.
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Affiliation(s)
- Sundo Jeong
- Department of Chemistry, Sahmyook University, Seoul, 01795, Korea
| | - Hongrual Park
- Department of Chemistry, Sahmyook University, Seoul, 01795, Korea
| | - Dongmin Seon
- Department of Chemistry, Sahmyook University, Seoul, 01795, Korea
| | - Jongwan Choi
- Department of Chemistry, Sahmyook University, Seoul, 01795, Korea
| | - Ki Bum Hong
- New Drug Development Center (NDDC), Daegu-Gyeongbuk Medical Innovation Foundation (DGMIF), 80 Cheombok-ro, Dong-gu, Daegu, 41061, Republic of Korea
| | - Jiseok Lee
- Department of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology, Ulsan, 44919, Korea
| | - Chaekyu Kim
- Department of Chemistry, Ulsan National Institute of Science and Technology, Ulsan, 44919, Korea
| | - Jung-Keun Kim
- Corporate R&D, LG Chem, Ltd., Research Park, 104-1 Moonji-dong, Yuseong-gu, Daejeon, 305-380, Republic of Korea
| | - Myoung-Hwan Park
- Department of Chemistry, Sahmyook University, Seoul, 01795, Korea.,Department of Chemistry and Life Science, Sahmyook University, Seoul, 01795, Korea
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8
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Smith MJ, Malak ST, Jung J, Yoon YJ, Lin CH, Kim S, Lee KM, Ma R, White TJ, Bunning TJ, Lin Z, Tsukruk VV. Robust, Uniform, and Highly Emissive Quantum Dot-Polymer Films and Patterns Using Thiol-Ene Chemistry. ACS APPLIED MATERIALS & INTERFACES 2017; 9:17435-17448. [PMID: 28441503 DOI: 10.1021/acsami.7b03366] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
This work demonstrates a facile and versatile method for generating low scattering cross-linked quantum dot (QD)-polymer composite films and patterned highly emissive structures with ultrahigh QD loading, minimal phase separation, and tunable mechanical properties. Uniform QD-polymer films are fabricated using thiol-ene chemistry, in which cross-linked polymer networks are rapidly produced in ambient conditions via fast UV polymerization in bulk to suppress QD aggregation. UV-controlled thiol-ene chemistry limits phase separation through producing highly QD loaded cross-linked composites with loadings above majority of those reported in the literature (<1%) and approaching 30%. As the QD loading is increased, the thiol and ene conversion decreases, resulting in nanocomposites with widely variable and tailorable mechanical properties as a function of UV irradiation time with an elastic modulus decreasing to 1 GPa being characteristic of reinforced elastomeric materials, in contrast to usually observed stiff and brittle materials under these loading conditions. Furthermore, we demonstrate that the thiol-ene chemistry is compatible with soft-imprint lithography, making it possible to pattern highly loaded QD films while preserving the optical properties essential for high gain and low optical loss devices. The versatility of thiol-ene chemistry to produce high-dense QD-polymer films potentially makes it an important technique for polymer-based elastomeric optical metamaterials, where efficient light propagation is critical, like peculiar waveguides, sensors, and optical gain films.
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Affiliation(s)
- Marcus J Smith
- School of Materials Science and Engineering, Georgia Institute of Technology , Atlanta, Georgia 30332, United States
- Air Force Research Laboratories, Wright-Patterson Air Force Base, Ohio 45433, United States
| | - Sidney T Malak
- School of Materials Science and Engineering, Georgia Institute of Technology , Atlanta, Georgia 30332, United States
| | - Jaehan Jung
- School of Materials Science and Engineering, Georgia Institute of Technology , Atlanta, Georgia 30332, United States
- Department of Materials Science and Engineering, Hongik University , Sejong 339-701, South Korea
| | - Young Jun Yoon
- School of Materials Science and Engineering, Georgia Institute of Technology , Atlanta, Georgia 30332, United States
| | - Chun Hao Lin
- School of Materials Science and Engineering, Georgia Institute of Technology , Atlanta, Georgia 30332, United States
| | - Sunghan Kim
- School of Materials Science and Engineering, Georgia Institute of Technology , Atlanta, Georgia 30332, United States
| | - Kyung Min Lee
- Air Force Research Laboratories, Wright-Patterson Air Force Base, Ohio 45433, United States
| | - Ruilong Ma
- School of Materials Science and Engineering, Georgia Institute of Technology , Atlanta, Georgia 30332, United States
| | - Timothy J White
- Air Force Research Laboratories, Wright-Patterson Air Force Base, Ohio 45433, United States
| | - Timothy J Bunning
- Air Force Research Laboratories, Wright-Patterson Air Force Base, Ohio 45433, United States
| | - Zhiqun Lin
- School of Materials Science and Engineering, Georgia Institute of Technology , Atlanta, Georgia 30332, United States
| | - Vladimir V Tsukruk
- School of Materials Science and Engineering, Georgia Institute of Technology , Atlanta, Georgia 30332, United States
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